Process for the preparation of 3- and/or 5-substituted anthranilic acids
US5189210A · kind A · utility
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6Claims
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Key dates
| Filing date | Apr 30, 1992 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Apr 30, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C229/56
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Anthranilic acids substituted in the 3- and/or 5-position are valuable intermediates for the production of agricultural chemicals. These substituted anthranilic acids can be obtained in good yield without undesirable isomeric byproducts by the oxidative ring-opening of dihydroquinolin-4-ones or quinolin-2,4-diones with t-butyl hydroperoxide in the presence of a base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.